Mechwarrior Costume - I talked my oldest son into being a robot for Halloween to save money. He decided he wanted to be a cool robot, so he chose a Madcat Mechwarrior.
The whole costume is made of cardboard, tape, glue and paint. The legs are jointed at the ankle, knee, and hip. The top is separate from the legs so it can pivot, and the cockpit is hinged so candy can be placed inside. Go to http://www.quitegraphic.com/Videos/HalloweenVideoPage.html to see video of this costume in action.